Reversing mechanism for internal-combustion engines.



E. 1. DUGAN & J..P. PANTE. REYEHSING MECHANISM FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED SEPT 19, I9l6- Patented Aug. 21, 1917.

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E. 1.. DUGAN & J. P. PANTE.

REVERS INGMECHANISM F OR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED SEPT. :9. m6.

1,237,314. I Patented Aug-21, .1917.

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EDWAItD DUGA'N AND JOHN P. PANTE. OF MEMPHIS. TENNESSEEM Specification of Letters Patent.

nnvnnsme MECHANISM ronmrnnnnn-oonnusrroiv ENGINES... f i

Patented Aug. 21, 1917.

Application filedseptember 19; 1916. Serial No. 121,045.

T all whom. it may concern: V 1

Be it known that Enwano J. DUGAN and JOHN P. PASTE, citizens of the United" States, residing at Memphis.v in the county of Shelby and State of Tennessee, have invent ed new and useful Improvements in Reversing Mechanism for Internal-Combustion Engines, ofwhich the following is a specification.

This invention relates to improvements in' reversing mechanisms for internal combustion engines of the four cycle type.

The chief characteristic of this invention resides in the provision of a device of the above described character in which the timingof the opening and closing of the valve is varied by means of cams which are movable axially of the cam shaft, the cam shaft being movable longitudinally to effect the adjustment of the cams.

Another characteristic of this invention is to provide a device of the above described character having manually operated means for moving theshaft to effect the adjustment of the cam, and means associated with the first mentioned means for temporarily breaking the ignition circuit upon the actuating of said cam shaft.

A further characteristic of this invention is to provide a reversing mechanism in which a threaded means is interposed between the cam shaft and the cam toeifect a predetermined movement of the cam upon moving the cam shaft longitudinally.

Other characteristics of the invention will appear as the specification is read in conne ction with the accompanying drawings, in which Figure 1 is a side elevation of the de-vlce showingthe same applied to aninternal combustion engine of the four cycle type, the internal combustion engine only belng shown; partly insection.

Fig. 2 is a longitudinal section of the Fig. 1. t

Fig. 3 is a transverse section taken on the line 3-3 of Fig. 1.

Fig. 4 is a detailed breaking mechanism. g

Fig. 5 is a transverse section taken on the line 55 of Fig. 1.

Referring to the drawings 1n detail, our invention is shown in this instance applied if toa crank case fully indicatedas at A,

whiclrhas its opposite end wall provided with alined bearings 1 and in which is jour- J view of the circuit naled a cam shaft 2. The cam shaft 2 is of such'a length as to'ha-ve the opposite'end thereof projecting beyond the opposite end of the crank case, the forward ends of the cam shaft being rectangular shape in cross "section as at 3, and upon which is slidabljv keyed a driving gear 4. To form a substantial support for'the forward end 3 of the shaft 2, the crank case A has its forward end provided with a substantially L shaped bracket- 5 which has its upper end .provided with a bearing 6 in which is journaled the outer end of the'forward end 3. The gear 4 is adaptedto be interposed between the forward bearing 1 and the bearing 6 where by longitudinal movement of the cam shaft may be had without moving the gear. The gear fis adapted to mesh with the gear mounted on the crank shaft whereby motion may be imparted to the cam shaft 2 as will invention, it is thought that the showing of the 521111018 unnecessary.

lo avold complexity of description we have shown only means for adjusting one pain upon the cam shaft although we wish it to be clearly understood that any number of cams may be simultaneously adjusted to revert the rotation of the-crank shaft with out departing from the spirit and scope of the invention. Arranged within the crank case A are a pair of spaced uprights 7 which have their upper ends provided with the an nular bearings 8. the cam shaft 2 being I sleeve 9 and interposed between the bearings 8 is a cam 11, the cam being of any suitable construction and having its inner surface provided with spirally arranged grooves 12, the grooves being adapted to receive the threads lO'whereby upon longitudinal movement of the sleeve, the cam will be rotated 'be understood. As means for rotating the I cam shaft no way adds to the utility of this between the bearings 8. Arranged directly above the cam 11 is a tappet 13 which is adapted to be actuated when the cam is r01.

tated. The gearend of the cam shaft 2 projects beyond the crank case A. and in this instance is provided with a spherical ball 14,

Q understood. Loosely lmounted upon the ball 14 is the substantially semi-sphericalsocket .18 .which hasits apex providedwith an eye 19. Secured to the rear end of the crank case A and extending longitudinally f of the same is a bracket which has its free end provided with a vertically disposed i Y tooth segmentj21; Pivotally secured to the bracket is the lower end of the actuating lever 22. The lever 22 is provided with an eye 23 in which is mountedone end of the link 24, the opposite end of the-link being mounted in. the eye 23, while the opposite end of the link 24 is pivotally mounted within the eye 19 whereby upon movement of the lever 2211 3011 its pivot, the cam shaft 2 will be moved longitudinally within the crank case. To look the lever in any desired I nally.

adjusted'position, the lever is provided with a spring pressed pivoted thumb latch lever 25 to which is connected the rod 26, the lower end of the rod being enga'geablewith the teeth of the segment 21 for -r kir' the lever in adjusted position. It be apparent that upon locking the thumb latch lever, the rod will be withdrawn against the tension of the spring from the teethof the segment 21 thus permitting the lever to'be rocked uponits pivot to move the shaft longitudi- To temporarily break the ignition circuit when adjusting the cam 11 in reversing the rotation of the crank shaft the thumb latch lever 29 is provided with extensions 27 which are normally engageable with the terminals 28 of the-ignition circuit, the latter not being shown. It will be evident'from' this construction that when the lever 25 is gripped to move the rod 26 to disengaging, positions, the extension-27 which istin engagement with the terminals 28 under the action of the coil springs, the lever will be rocked upon its pivot to move the extension into disengaging position with relation to the terminal whereby the ignition circuit will be broken as will be understood.

From the foregoing description taken in connection with the accompanying drawings, it will be seen that when it is desired to reverse the rotation of the crank shaft, by rocking the lever 22 upon its pivot, the shaft 2will be moved longitudinally of the crankshaftthereby imparting a similar mo tion tothe sleeve 9 thus causing the threads to engage the walls of the grooves 12 of the cam and-thereby partially rotating the cam axially of the cam shaft. It will be thus seen that the cam surface of the cam 11 will portion, means for moving the shaft lo mew/.314

The forward portion 3 of the'lshaft will permit movement of the said shaft without afifecting the gear, thus'motion may be imparted from the crank shaft to the cam shaftduring any adjustment of the cam shaft. It will be further noted that owing to the connection'between the camand the cam shaft,

the cam may be moved in the path of an are in either direction depending upon which direction the cam shaft is moved whereby any desired adjustment may be obtained for efi'ecting the reversing of the engine as has been described. 1

lever 22,'the' lever 25 is rocked upon its pivot so as to cause the extension 27 to disengage the terminal 28 to eflect a temporary break: ing of the ignition without the liability of the gas within the cylinder exploding to cause contrary movement of the crank shaft. hen the cam has been adjusted to the de-' sired degree, the thumb latch lever 25 is of course released whereby the spring will Simultaneously with the movement ofthe actuate the extension to move the same into contact with the terminal 28-; Thus the circuit to the ignition system will be tempo rarily broken to permit the adjusting of the cam.

It is thought from the foregoing taken in connection with the accompanying drawings that the construction and operation of our.

device will be apparent to those skilled in shape, proportion and minor details of conthe art and that minor changes in the size,

struction may be made without departing from the spirit and scope of the appende claims. V

. What we claim is a 1. A reversing mechanism for gas en-" gines comprising a longitudinally movable moving the shaft longitudinally, a universal joint connecting said shaft and said manu- .cam shaft, manually operated means for ally operated means, means for rotating the shaft, a sleeve keyed to the shaft, spirally arranged threads formed on the outer sur-' face of the sleeve, and a cam having spirally arranged grooves formed therein .to receive said threads whereby upon longitudinal movement of the cam shaft, the cam will be rotated axially upon the shaft and a tappet engageable with said cam.

2. A reversing mechanism for gas engines, comprising a longitudinally movable cam shaft, a portion of said shaft being angular formation, a gear mounted on's tudinally, means engageable with said 9 i. for rotating said shaft, spaced beari circling the shaft, a sleeve keyed shaft and journaled Flv c spirally arrange-"Z l out er surface of said s1eeve, a cam surround.-

ging said sleeve at intervals between said hear1ngs, the inner surface of said cam being gines, comprising a longitudinally movable shaft, means for rotating the shaft,'manu-' ally operated -means for moving the shaft longitudinally, a-cam mounted on the shaft,

means interposed between the cam and the shaft for imparting an independentlrotary I "motion to the cam upon the shaft uponlon In' testimony gitudinal movement. of saidshaft, a'

allyoperated means, and a terminal of I an ignition cirouit.-alsocarried bysaid manuall operated shaft moving means and adapted to contact with the spring pressed member; whereby, the vignitigm circu'it will be broken in advance of movement of theeam shaft.

tures.

. 1 EDWARD J, DUGA-N. a

JOHN P.' PANTE,

the longitudinal whereof We aflix our signa 15 spring pressed 'member carried by the manu- 4 

